DE838132C - Incandescent sleeve, in particular for eliminating pipe stresses and for normalizing the material processed during welding and its transition structure - Google Patents

Description

(WiGBl. P. 175)

ISSUED MAY 5, 1952

M 7404 V14g

At welding points and especially in boiler and pipeline construction occur after a welding process considerable tension within the material, which makes it particularly susceptible to cracking is promoted.

These tensions can occur in boiler and pipeline construction lead to major operational disruptions after commissioning the systems, which is why after Joint welding to achieve the finest possible grain of the material and high impact values normalizing or stress-free annealing must be carried out.

The coarse-grained structure of the material can be partly due to a high C or Si content of the Base material, by the influence of oxygen, by gas influences or by overheating arise in both electric and oxy-fuel welding.

This coarse-grained structure can be reduced to a minimum ao by means of appropriately designed incandescent burners measured to allow the material and tension of the same to be the same as before welding resumes existing state.

In the case of moving small parts, this can be done by inserting the objects into the appropriate incandescent ovens without further ado.

In the case of large-scale systems in boiler and pipeline construction and stationary equipment, this Working method are no longer used, which is why the inventor set himself the task of

a device in the form of a non-stationary and therefore very mobile incandescent burner create.

This means, for example, that pipes are welded to the pipe can be annealed, this point must be with a divisible cuff-like Incandescent burner are surrounded.

Combustion of propane (C ₃ H ₈ ) with the addition of oxygen (O ₂ ) results in incomplete combustion with an excess of carbon (C). This removes oxygen from the rising air. The protective gas layer that occurs as a result prevents undesired effects on the mass to be glowed. An impairment from outside is therefore out of the question.

The burning gas column, which is located within the incandescent burner halves, provides absolute temperature compensation and a uniform structure. Due to this intensity, the structural changes are carried out in a very short time without being able to leave harmful influences behind ^{in the critical danger zone of 400 to 500 0 blue heat.}

Fig. 1 of the drawing represents an embodiment an example of an incandescent burner for operation with a propane-oxygen mixture.

From Fig. 2 the cooling water inflow and outflow as well as the feed for the gas mixture is in side view recognizable.

Fig. 3 shows the arrangement of the burner nozzle with the cooling water space behind it in section pictured.

So that the incandescent burner can be attached to the welding points, it is designed to be divisible and consists of two halves 1 and 2.

These two halves become hinge-like at 3 and 4 held and thereby form a closed ring.

Connections 5 and 6 are intended for the supply of the gas mixture (propane-oxygen).

The cooling water is at 7 and 8 in the burner

passed and discharged again at 9 and 10 after the cooling process.

The mode of operation can be easily seen from Figure 1 of the drawing.

The supply of the propane-oxygen mixture takes place through the connecting pieces 5 and 6 to the Incandescent burner and enters through the openings 11 in the Ring cross-section for inflammation.

The openings 11 are arranged offset in this way and are carried out to the outside in a particularly tight sequence, so within the glow ring uniform temperature prevails.

By cooling with cold water it is achieved that inadmissibly high temperatures at the burner itself cannot occur, since the resulting explosions in the case of a strongly heated one Apparatus omitted.

There is therefore no scorching or burning.

The cooling water supplied at 7 and 8 must be in constant circulation during the annealing process stand.

With this invention, a device was created with which the operational safety in the boiler and pipeline construction is increased significantly.

The susceptibility to cracking of the material is increased by the stress-free or normalizing annealing pushed down a minimum, if not completely turned off.

A propane-oxygen mixture can be used to normalize the material, but just as well a different gas-oxygen mixture, for example luminous gas, can also be used. Through the high intensity of the burner, there are short temperature intervals in the inner and outer skin of the material, which are not noticeable or hardly noticeable at all during the stress-free annealing, how z. B. in the normalizing glow. The cause lies in the short glow time.

Claims (3)

Patent claims: 1. Glow collar, characterized in that two semicircular shells (1 and 2) through Joints (3 and 4) coupled to form a closed ring. 2. glow sleeve according to claim 1, characterized in that for each burner half (1 and 2) Cooling water supply and drainage lines (7 and 9 or 8 and 10) independently of one another are connectable. 3. glow sleeve according to claim 1 and 2, characterized in that spaces (12 a and 12 b) for receiving or flowing through the cooling water distributed over the entire ring are. 1 sheet of drawings 1 5137 4.